<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Gravity Ball</title>
    <style type="text/css">
        canvas {
            border: 1px solid black;
            height: 100%;
            width: 100%;
        }

        body {
            margin: 0;
            /* 调整边缘 */
        }
    </style>
</head>

<body>
    <canvas>

    </canvas>
</body>
<script src="../js/Gravity.js"></script>

</html>